From: Conrad Taylor
Subject: peek-char routine for PC Scheme...???
Date: Sat, 24 Apr 1993 17:57:10 +0000
Message-ID: <C601vB.C3n@cs.uiuc.edu>

         Does snyone have a peek-char routine as discussed in
R4RS that could be used for PC-Scheme?  I have discovered that
PC-Scheme 3.03 doesn't consist of this routine at the moment.
Also, has anyone had any success in using the slib library with
PC-Scheme?  If so, could you explain the process on how to use
the SLIB Library with PC-Scheme (creating an init file for PC-
Scheme)?

Thanks in advance,

-Con

From: Kellom{ki Pertti
Subject: Re: peek-char routine for PC Scheme...???
Date: Tue, 27 Apr 1993 07:17:04 +0000
Message-ID: <PK.93Apr27091704@talitiainen.cs.tut.fi>

In article <··········@cs.uiuc.edu> ·······@cs.uiuc.edu (Conrad Taylor) writes:
	    Does snyone have a peek-char routine as discussed in
   R4RS that could be used for PC-Scheme? 

For some purposes you can use char-ready?, which takes an optional
port argument. It returns #t, if there is a character waiting that can
be read using read-char. If the port is at the end of file, it returns
an end-of-file object, and #f otherwise.

If you would uuse peek-char to provide a lookahead token, you may need
to buffer one character yourself.

--
Pertti Kellom\"aki (TeX format)  #       These opinions are mine, 
  Tampere Univ. of TeXnology     #              ALL MINE !
      Software Systems Lab       #  (but go ahead and use them, if you like)